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Water observed in the atmosphere of τ Boötis Ab with CARMENES/CAHA
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Webb, R. K., Gandhi, Siddharth, Brogi, Matteo, Birkby, Jayne L, de Mooij, Ernst, Snellen, Ignas and Zhang, Yapeng (2022) Water observed in the atmosphere of τ Boötis Ab with CARMENES/CAHA. Monthly Notices of the Royal Astronomical Society, 514 (3). pp. 4160-4172. doi:10.1093/mnras/stac1512 ISSN 1745-3933.
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WRAP-water-observed-atmosphere-τ-Boötis-Ab-CARMENES-CAHA-Webb-2022.pdf - Published Version - Requires a PDF viewer. Available under License Creative Commons Attribution 4.0. Download (2396Kb) | Preview |
Official URL: https://doi.org/10.1093/mnras/stac1512
Abstract
Characterising the atmospheres of hot Jupiters is important in understanding the formation and migration of these exotic planets. However, there are still many open questions about the chemical and physical properties of these atmospheres. Here, we confirm the detection of water vapour in thermal emission from the non-transiting hot Jupiter τ Boötis Ab with the high resolution NIR CARMENES spectrograph. Combining over 17 h of observations (560 spectra) and using a Bayesian cross-correlation to log-likelihood approach, we measure a systemic velocity of $V_{\mathrm{sys}} = -11.51^{+0.59}_{-0.60}$ km s−1 and a radial velocity semi-amplitude of $K_{\mathrm{P}} = 106.21^{+1.76}_{-1.71}$ km s−1 for the planet, which results in an absolute mass of $M_{\mathrm{P}} = 6.24^{+0.17}_{-0.18}\, \mathrm{M_{J}}$ and an orbital inclination of $41.6^{+1.0}_{-0.9}$ degrees. Our retrieved Vsys shows a significant shift (+5 km s−1 ) from the literature value, which could be caused by an inaccurate time of periastron. Within the explored model grid, we measure a preference for solar water abundance (VMR = 10−3) and no evidence for additional minor species in the atmosphere. Given the extensive orbital coverage of the data, we searched for a phase dependency in the water signal but found no strong evidence of variation with orbital phase. This detection is at odds with recent observations from SPIRou/CFHT and their tight upper limit on water abundance. We recommend further observations of the atmosphere τ Boötis Ab to try and resolve these discrepancies.
| Item Type: | Journal Article | |||||||||||||||
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| Subjects: | Q Science > QB Astronomy | |||||||||||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||||||||
| SWORD Depositor: | Library Publications Router | |||||||||||||||
| Library of Congress Subject Headings (LCSH): | Planets -- Atmospheres, Satellites -- Atmospheres, Astronomy -- Observations, Astrophysics | |||||||||||||||
| Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | |||||||||||||||
| Publisher: | Oxford University Press | |||||||||||||||
| ISSN: | 1745-3933 | |||||||||||||||
| Official Date: | August 2022 | |||||||||||||||
| Dates: |
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| Volume: | 514 | |||||||||||||||
| Number: | 3 | |||||||||||||||
| Page Range: | pp. 4160-4172 | |||||||||||||||
| DOI: | 10.1093/mnras/stac1512 | |||||||||||||||
| Status: | Peer Reviewed | |||||||||||||||
| Publication Status: | Published | |||||||||||||||
| Access rights to Published version: | Open Access (Creative Commons) | |||||||||||||||
| Date of first compliant deposit: | 4 August 2022 | |||||||||||||||
| Date of first compliant Open Access: | 9 August 2022 | |||||||||||||||
| RIOXX Funder/Project Grant: |
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